›› 2013, Vol. 34 ›› Issue (11): 3291-3298.

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Preliminary numerical simulation of zonal disintegration phenomenon in deep surrounding rock mass based on extended finite elements

CHEN Xu-guang1, 2，ZHANG Qiang-yong3，LI Shu-cai3，MEI Yu1, 2   

  1. 1. Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing 210098, China; 2. Institute of Tunnel and Urban Railway Engineering, Hohai University, Nanjing 210098, China; 3. Geotechnical & Structural Engineering Research Center, Shandong University, Jinan 250061, China
  • Received:2011-12-17 Online:2013-11-09 Published:2013-11-11

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Abstract: The contour method of tracking the trajectory of rock crack propagation was embedded into extended finite elements (EFE) platform of ABAQUS to simulate the process of initial crack extension under uniaxial pressure. The result testifies the effective of the simulation method. Then, the arc-circular fracture stress strength factor was embedded into the EFE platform. Using the maximum circumferential tensile stress criterion as cracking criterion, when the stress is greater than that rock fracture toughness, the initial crack within surrounding rock begins to extend. Based on this, a numerical simulation of the simplified round tunnel is carried out with the model test which the zonal disintegration phenomenon is observed. During the simulation process, the subdomain precise integration is adopted to improve the precision. The simulation results show that there appears 3 to 4 layer zonal disintegrations surrounding the deep tunnel. The numerical simulation indicates that there exists zonal disintegration phenomenon in deep surrounding rock mass. Comparing the numerical simulation with the ruin pattern of tunnel model after the model test, it is found that the distribution character is in coincidence with each other. The numerical simulation results show that the EFE method is effective in dealing with the problems of complex fracture in rock mass.

Key words: zonal disintegration, extended finite element method(EFEM), stress strength factor, subdomain precise integration

CLC Number: 

  • TU 454
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